Carbon set or pile



Feb. 19, 1929.

L. E. LENTZ' CARBON SET OR' PILE -Filed June 7, y1926 ,wm N@ duerma,

Patented Feb. 19, 1929.

vUNITED-STATit-:s

PATENT oFFlcE.

FISHER COMPANY,

A CoaroaATIoN or DELAWARE.

CARBON SET OIR, PILE.

original application mea reb'ruary 27, 1925, serial nu. 11,995. Divided and this application mea June 7, 1926.. Serial No. 114,278.

This invention relates to an improved car- 4 n roll, set or pile and to the inet-hed for producing thesame. y

The object of the invention is to'incrcase the average durability and manifolding qualities of the carbon sheets of a-set, pile or roll of 4carbons to-be used in manifolding for instance'as set lforth in my (zo-pending appli-- cation Serial 1925,'and ofwhich the present application is a division.

Another obj ect of the invention is to reduce the manufacture of a carbon set, regardless of form, to alcomprehensive method of procedure.

In the accompanying drawings: I

Figure 1 i's'ja 'diagrammatic view of the car,- bon Astrips or webs, the uppermost; pair of which are ofsomewhat heavier paper stock.

stock,

Figure 2 isa similar view, showing the webs arranged in groups, each of a different weight of stock. l

Figure 3 is a view indicating the arrangement of the carbon strips in graduated `weights of stock.

Figure iindicates the composition of a .roll in which the weight of stock is similar to Figure 1, but distinguished by the coating of the.

heavier carbon strips with a relatively hard carbon surface and the lighter stock with a relatively soft carbon composition. Figure 5. shows a roll composition similar to that shown in Figure 2, stock, but vwith each group .of strips from the bottom upward. treated with progressively .harder manifolding material.

Figure 6 shows the'strips of graduated as in Figure 3, but with the sheets treated with manifold material graduated in degrees of hardness from a-softformula at the bottom to a very hard single copyformula on the topfsheet. A A

Figure 7 shows all the strips of the same stock,`but with a vgradual increase of hardness of the lmanifoldingmaterial from the Y bottomup and,`

Figure 8 is a pefspective view showing a set of. strips or webs assembled in the form of a carboroll.

A source of carbon mutilation is more or less inherent in the carbon paper and in. its mode of use in manifolding machines. Ob-

viously, when a large number of paper webs are lemployed and a correspondingly large No. 11,995, filed February 27,

as to weight'oi:l l

hardness,

number of carbons, 4the printing mechanism must be capable of very .heavy manifolding action.' This has resulted in the comparativelyrapid mutilation .of the top .sheets by the cutting through ofthe `types.- To avoid thisresult I propose-to form the two uppermostcarbon strips or sheetsof somewhat heavier 1). Another variation o the same thoug t is the arrangement of the sheets or stripsfof the multiple carbon roll in groups, thestockpf each groupbeing somewhat heavier than that stock than the underlyin sheets (see Fi re,

of the subjacent group (see Figure 2). A still further variation of the thought is indicated* in Figure .3. This contemplates a" diierent weightof stock.- for each strip so that the resistance of 'each strip fro'mthetop down will diminishA while the m'anifoldinpf4 ssibilites 'of the strips will increase as the orce of the printing blow diminishes.. A third source of carbon mutilation has been due to the treat-y ment of the carbon strips with auniform carbon lcorn-pound. It has been'found, however,

the practically unused lower carbons. To Oifset this condition I propose to vary the hardness of the carbons su stantially in accordance with the force of the printing blow sustained by them. For instance, in Figure 4 there is indicated a'series of webs in which the two uppermost sheets are of heavier stock i as in Figure 1, and these sheets are treated with aharder carbon formula than thesheets 'of lighter stock located below. In AFigure 5 the strips arefformed as in Fi ure 2 of different Wei/ghts of stock arrange in groups and in addition to this peculiarity each group is coated with carbon of a diierent degree of the uppermost group being. the hardest and the lowermost group, the softest. The same thought is carried out in Figure 6 in which the carbon strips are graduated as to weight of stock and are coated with carbon of graduated degrees of hardness. Thus, the uppermost sheet has the-greatest resistance, both as to weight of stock andhardness of carbon, while the lowermost sheet has the least resistance in both respects. ln Figure 7 is a further variation which consists in coa-ting sheets, all of which are of the same Weight of stock, With carbon of graduated degrees of hardness. ln other Words, While the stock of all sheets in Figure 7 is of the same Weight,

-the carbon coating of each sheet is of a difbe Aclearly understood, but ll wish to reserve the right to eect such variations thereof as'v may fall fairly within the scope of the protection prayed.

`What l claim is:

Lacasse 1. The method of producing a carbon set which consists in treating paper sheets of ydifferent Weights with carbonizing compositlons of different degrees of hardness and superposing said sheets to form a set in Which the sheets of greatest Weight Will be at the top and theleast Weight will be at the botto-1n and in which the carbon composition Will be hardest at the top] of the set and softest at the bottom thereof.

2. As an article of manufacture, a manifolding assembly of carbon sheets, the carbon coatingsof which are of graduated relative hardness, whereby the transferring capacity of the sheets increases relatively through the assembly.

3. As an article of manufacture, a manifolding assembly of carbon sheets of graduated Weights having carbon coatings of correspondingly graduated hardness'whereby the relative' durability of the sheets andthe relative transferring capacity thereof is oppositely graduated through the assembly.

In testimony whereof I have affixed my signature.

LAURENCE n. LENTZ.' 

